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Franke, Richard H.; Paduch, Pamela J. – 1984
Since the time of Galton, high correlations have been noted in the IQ levels of identical twins, with relationships for twins reared in different families being only slightly lower than for twins reared together. This evidence has been held to demonstrate that intellectual differences among individuals and among groups are largely determined by…
Descriptors: Educational Environment, Intelligence Quotient, Nature Nurture Controversy, Nutrition
Peer reviewedLight, Jacquelyn Gillis; DeFries, John C. – Journal of Learning Disabilities, 1995
Data from 148 identical and 111 fraternal twin pairs in which at least 1 member had a reading disability were statistically analyzed. Results suggest that genetic and shared-environment influences both contribute to the observed covariance between reading and mathematical deficits. (Author/DB)
Descriptors: Etiology, Family Environment, Genetics, Learning Disabilities
Peer reviewedBishop, D. V. M.; Bishop, Sonia J.; Bright, Peter; James, Cheryl; Delaney, Tom; Tallal, Paula – Journal of Speech, Language, and Hearing Research, 1999
A study involving 55 children with a language impairment and 76 with normal language investigated the heritability of auditory processing impairment in same-sex twins (ages 7 to 13, selected from a sample of 37 pairs). Although correlations between co-twins were high, lack of significant difference between monozygotic and dizygotic twins suggested…
Descriptors: Auditory Perception, Children, Genetics, Hearing Impairments
Peer reviewedHerman, Rosemary – Early Child Development and Care, 1984
Reviews current research on a woman's chances of bearing twins and the genetic relationship, prenatal competition, and personality similarities between twins. In addition, the nature/nurture controversy is discussed in terms of evidence from studies of identical twins reared apart. Future studies are suggested to discover the ways twinning might…
Descriptors: Birth, Evolution, Genetics, Heredity
Peer reviewedOlson, Richard; And Others – Journal of Learning Disabilities, 1989
Word recognition data from identical and fraternal twins and siblings (N=172) indicated that the phonological coding deficit of children with reading disabilities was highly heritable. Orthographic coding was not significantly heritable. Poor readers with low IQs were superior to similar reading but average IQ readers in phonological coding.…
Descriptors: Elementary Secondary Education, Genetics, Heredity, Intelligence Differences
Peer reviewedDaniels, Denise; Plomin, Robert – Developmental Psychology, 1985
Used the Sibling Inventory of Differential Experience with 396 adolescent and young adult children to determine the extent to which genetic differences between siblings or sibling differences in family constellation variables were responsible for differential experiences. (HOD)
Descriptors: Adolescents, Adopted Children, Comparative Analysis, Family Environment
Peer reviewedHolden, Constance – Science, 1987
Reports on the findings of several studies into the genetic similarities of twins. Focuses on the relationships between personality and behavioral genetics and argues that genetic similarity seems to be a better predictor than environmental factors. Discusses psychopathology, cognitive abilities, and personality. (TW)
Descriptors: Biology, Genetics, Habit Formation, Heredity
